Method of winding coils for dynamo-electric armatures



(No Model.)

E. THOMSON. METHOD OF WINDING GOILS FOR DYNAMO ELECTRIC? ARMATURES: No.503,445. Patented Aug. 15, 1893.

0 5 J? U I j n Fl ai FTE 4- J? G 5 fl W|TNE55E5 |[\]\/E|\|TDF\ UNITEDSTATES PATENT OFFICE.

ELIHU THOMSON, OF SWAMPSOOTT, ASSIGN OR TO THE GENERAL ELECTRIC COMPANY,OF BOSTON, MASSACHUSETTS.

METHOD OF WINDING COILS FOR DYNAMO-ELECTRIC ARMATURES.

SPECIFICATION forming part of Letters Patent No. 503,445, dated August15, 1893.

Application filed April 19, 1 893. Serial No. 470,962. (No model.)

To all whom it may concern.-

Be it known that I, ELIHU THOMSON, a citizen of the United States, and aresident of Swampscott, in the county of Essex and State 5 ofMassachusetts, have made certain new and useful Improvements in theMethod of VVinding Oolls for Dynamo-Electric Armatures, of which thefollowing is a specification.

My invention relates to the winding of coils ro for dynamo electricarmatures and has forits object to provide a method of winding suchcoils which may be economically practiced and which enables me toconstruct such coils with uniformity and cheapness. To this end :5 IWind the coil upon a form in a trapezoidal shape, and then distort orchange the shape of the trapezoid into two incomplete rectangles, asmore fully pointed out hereinafter.

In the drawings hereu nto annexed and hereby made part of thisspecification, Figures 1, 3 and 5 are front elevations of coils in thediiferent stages of process of forming; Figs. 2 and 4 are sideelevations of the coils shown in Figs. 1 and 3, and Fig.6 is an endelevation of the completed coil as shown in Fig. 5.

The coil which I design to construct is substantially the same inconstruction as those shown in the patent to Rudolph Eickemeyer, No.877,996, February 14, 1888, and is used in the same way; my inventiontherefore does not reside so much in the coil itself as in the method ofmanufacture.

A is a coil formed after my invention as illustrated in Fig. 1, andshown just after 5 leaving the former upon which it is wound; thisformer is of a shape shown by the inner lines of Fig. 1, that is, atrapezoid having the sides a, 1) parallel and the sides 0, (l similarlydivergent from the ends of the side Z). The

former is collapsible, as commonly practiced in such operations; andafter the coil A is wound upon it the form is collapsed and the coil iswithdrawn from it and wrapped with insulating tape or otherwiseinsulated in a well-known manner. After being withdrawn from the formthe sides 0, cl of the coil are bent inward at n, o in the manner shownin Fig. 3, so as to convert the trapezoid into a figure composed of twoincomplete rectangles, their common sides beingmissing. After beingbrought into shape of Fig. 3, the two rectangles are bent into differentplanes, as illustrated by the end view in Fig. 6, when the coil may beapplied to an armature core in well-known ways. 5 5

Having thus described my invention, what I claim as new, and desire toprotect by Letters Patent of the United States, is-

1. The method of forming a coil for a dynamo electric armature as hereindescribed, which consists in winding a coil 011 a form into atrapezoidal shape, then removing it from the form, and then distortingorbending the trapezoid into two incomplete rectangles with their commonside missing.

2. The method of forming a coil for a dynamo electric armature, whichconsists in winding the coil upon a form into trapezoidal shape, thenremoving it therefrom and distorting the trapezoid into two incompleterect- 7o angles, and then bending the rectangles into different planes,substantially as described.

In witness whereof I have hereunto set my hand this 17th day of April,1893.

ELIHU THOMSON.

WVitnesses:

JOHN W. GIBBONEY, BENJAMIN B. HULL.

